结果表明：均匀沉淀法优于直接沉淀法；表面活性剂的加入有利于改善粉体团聚。
The results showed that homogeneous precipitation method is superior to direct precipitation method and adding surfactants is useful to improve powder reuniting.
本论文以河南锆硅渣为原料，研究了分别采用化学沉淀法和直接中和法制备白炭黑的技术和工艺。
In this paper, preparation processes of amorphous silica using Henan Zr-containing silica residue as raw materials with chemical precipitation and direct neutralization methods were researched.
实验结果证实，它们都可以作为催化剂的载体，沉淀法承载金属催化剂，直接裂解乙炔，催化合成多壁碳纳米管。
Experimental results proved that both of them could support metallic catalyst by precipitation, and directly decompose acetylene to prepare multi walled CNTs.
同时采用直接压片和捣碎水洗沉淀法检查囊蚴。
Direct compression tablets and crush washed precipitated methods were used at the same time to check metacercariae.
通过沉淀法和直接法制备羧酸稀土配合物，与丙烯酸等单体共聚反应制备不同稀土含量的稀土有机高分子离聚物。
Synthesises rare earth complex monomer was conducted by sedimentation and direct method. The rare earth organic ionomer was synthesized by copolymerization of acrylic acid monomer.
通过沉淀法和直接法制备羧酸稀土配合物，与丙烯酸等单体共聚反应制备不同稀土含量的稀土有机高分子离聚物。
Synthesises rare earth complex monomer was conducted by sedimentation and direct method. The rare earth organic ionomer was synthesized by copolymerization of acrylic acid monomer.
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